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The Third Founding was the second Founding of Space Marine Chapters after the original founding of the Legions, taking place in M31.^{[Needs Citation]}

List of 3rd Founding Chapters

Below is a list of 3rd Founding chapters.

Chapter Name	Parent Chapter	Homeworld	Notes	Source
Flesh Eaters	Blood Angels		Cannibalistic	[Needs Citation]
Scythes of the Emperor	Ultramarines	Sotha (destroyed)		[Needs Citation]